CENTRAL STARS OF PLANETRY NEBULAE

[21] SHKLOVSKY IS, 1956, SOVIET ASTRON J, V33, P315

[22] VORONTSOVVELYAM.BA, 1953, GASNEBEL NEUE STERNE

[23] ABSOLUTE MEASURES OF STELLAR RADIATION [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1960, 121 (01) : 17 - 40

[24] WURM K, 1952, Z ASTROPHYS, V30, P387

[25] WYSE AB, 1942, AP J, V95, P359

[21] SHKLOVSKY IS, 1956, SOVIET ASTRON J, V33, P315

[22] VORONTSOVVELYAM.BA, 1953, GASNEBEL NEUE STERNE

[23] ABSOLUTE MEASURES OF STELLAR RADIATION [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1960, 121 (01) : 17 - 40

[24] WURM K, 1952, Z ASTROPHYS, V30, P387

[25] WYSE AB, 1942, AP J, V95, P359